On Thu, Feb 16, 2017 at 10:42 AM, Christopher Hoover <c...@murgatroid.com> wrote:
> Ntp has support to pick up hardware packet timestamps from the Linux > kernel. I wrote the patch; it was merged years ago. > > I'm wrong about this. The patch I wrote added support for SO_TIMESTAMPNS (see [1]). With SO_TIMESTAMPNS, the kernel puts the timestamp on the packet just after the driver hands it to the receive path. There's a newer interface, SO_TIMESTAMPING, for access to NIC hardware timestamps. There's no support it on the ntp head for this AFAICT. The necessary patch looks straightforward, but I don't think I have the hardware to test it. -- Christopher 73 de AI6KG. [1] https://www.kernel.org/doc/Documentation/networking/timestamping.txt -c73 de AI6KG > > > > On Thu, Feb 16, 2017 at 9:59 AM, Denny Page <de...@cococafe.com> wrote: > >> If your Ethernet chipset (mac or phy) has timestamping capabilities, you >> can use Chrony which has hardware timestamp support. This greatly improves >> accuracy, and generally eliminates the CPU loading issue. >> >> Denny >> >> _______________________________________________ >> time-nuts mailing list -- time-nuts@febo.com >> To unsubscribe, go to https://www.febo.com/cgi-bin/m >> ailman/listinfo/time-nuts >> and follow the instructions there. >> > > _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
